[flutter] Using `dart run flutter_launcher_icons` destroys ios-project

提示错误：

The project ‘Runner’ is damaged and cannot be opened due to a parse error. Examine the project file for invalid edits or unresolved source control conflicts.

或

这个问题在官方 github issues 中也有所提及。

打开 Runner.xcodeproj 后发现文件结尾多了些奇怪的字符：

删除之后，Runner 可以正常打开。